HP: Dangerous Professor from Azkaban

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It was already the afternoon of the next day when Sagres returned to Hogwarts.

Having perfectly achieved the purpose of his trip, he now sat in his office chair, gazing at the exquisite hourglass in his hand, a pure smile gracing his face.

The Time-Turner—the Ministry of Magic's top-secret item, restricted to approved users. This was an extremely special magical device, with only one function: time travel.

He still remembered that in his previous life, the famous theoretical physicist Stephen Hawking had proposed the "chronology protection conjecture." He believed that quantum effects would prevent macroscopic time travel, thus avoiding all paradoxes.

More than twenty years had passed, and those theories still left vague impressions in his mind, as he had once deeply believed in science.

However, ever since his transmigration, he had converted to Magic.

Returning to the past—this was undoubtedly a desire everyone had harbored at some point.

Sagres was no exception, but that was a thought from before his transmigration. Now, he studied the Time-Turner not to go back and undo regrets, but purely for the sake of Magic itself.

After thoroughly examining the hourglass, his brows furrowed slightly.

"Let me think..." Sagres fell into contemplation. "There are a few points to consider: the grandfather paradox and the butterfly effect. The former causes logical contradictions, leading to timeline collapse; the latter may cause a predetermined future to become unrecognizable due to tiny changes."

The essence of timeline collapse lies in the loss of logical coherence in reality—its consequences far exceed human comprehension and control. It is not just physical destruction, but the complete negation of meaning, causality, and free will.

Sagres tried to understand time travel with his current knowledge but quickly gave up. If an event occurred due to his future self intervening in the past, wouldn't that be putting the cart before the horse—falling into an endless loop?

"I won't think about it for now." Waving his hand to shoo away the raven Noctis, he decided to first repair the time-turner in his hand and test it himself.

This way, he could also gain a more detailed understanding of how Time Magic operated.

...

The core of the time-turner was interwoven with Time Dust and Threads of Fate. These corresponded to the laws of celestial motion and the concretization of causality, respectively.

The issue with the time-turner in his hand lay in the Time Dust.

Long-term use had inevitably consumed a portion of the Time Dust, which disrupted the balance between the two forces, ultimately leading to the device's malfunction.

To repair it, one had to adjust the resonance frequency of these two forces to restore balance.

However, the problem was that Sagres currently had no additional materials to supplement the repair.

"Since I can't restore the original balance for now, can I achieve a new one instead?" The thought struck him like a flash of inspiration, and he decided to try a different approach—extracting a portion of the Threads of Fate to reestablish equilibrium.

"I'm truly a genius!" Sagres marveled at his own idea.

With a clear direction, the repair work progressed rapidly.

...

After three days and two nights of relentless effort, the time-turner finally came back to life.

"Nothing more than this!" He proudly examined the hourglass in his hand, unable to hide his excitement.

"Let's test it for one minute first." Sagres stepped into the corridor, set the dial, and inverted the hourglass.

Instantly, his body froze, but his mind became unusually active.

He saw the birds outside the window flying backward, the sunset reverting to the blazing midday sun, the raven Noctis flying in and out of the window, distant leaves turning from yellow to green, snow rising from the ground into the sky, and the office furnishings shifting, with many unfamiliar figures coming and going.

Eventually, even the walls and the surrounding ceiling vanished.

When he regained control of his body, he found himself standing atop a large rock in the middle of a wilderness.

Sagres turned his head to take in the surroundings, a trace of long-lost bewilderment flickering in his eyes.

Where the hell did this thing take me?

Hogwarts is gone?

The confusion on his face gradually turned into horror.

So... this is at least a thousand years ago!

Sagres finally decided to behave himself...

He picked up the hourglass and examined it over and over, but he still couldn't identify the problem. The sand within the hourglass continued to flow against gravity, from bottom to top—so where exactly had the issue occurred?

Using the time-turner to travel to a timeline where he didn't originally exist—Sagres had no idea how that was even possible. After all, Time Magic was incredibly complex, and he had only recently begun to study it.

Perhaps, when the sand in the time-turner completely flowed backward, he would return to his original timeline?

"This will probably take a few days…" Sagres estimated mentally as he observed the sand's flow speed.

Fortunately, he still had his wand and all his belongings. He checked through them carefully and even pulled out a small half-bottle of Felix Felicis from his pocket.

Thanks to Veiliss, and regardless of whether this "time-traveling lucky potion" would actually work, he went ahead and took three drops.

"At least a thousand years... I hope it's still within its shelf life!" Sagres sighed, then immediately corrected himself. "No—logically, since its production date is over a thousand years in the future, it hasn't expired at all!"

He tried to remain optimistic. After all, things couldn't possibly get worse than they already were... right?

Sagres looked around once more, trying to find something that matched his memory of Hogwarts, but quickly gave up.

Time had left deep marks on this land. If he hadn't seen it with his own eyes, he would never have believed that this barren land was the original site of Hogwarts.

"What are you looking for?" A clear, cold female voice suddenly came from behind him, and Sagres's spine instantly tensed.

The voice was so close it felt like a whisper in his ear, yet he hadn't noticed anyone approaching at all—this was simply incredible.

"Shadowless Swift!"

Sagres almost instinctively activated his teleportation magic, executing three consecutive spatial jumps that caused piercing sonic booms.

His figure left three afterimages in the air, finally landing atop a large boulder ten meters away.

His wand was already aimed at the source of the voice, scarlet spelllight gathering at the tip and distorting the surrounding air with its intensity.

Only then did he clearly see the person's appearance.

It was a tall woman dressed in silver-blue robes.

Her gaze was calm, her demeanor elegant, as if she didn't care in the slightest about the wand pointed at her.

"What did you just drink?" the woman continued, her tone strangely flat—almost devoid of any emotion.

Sagres's expression darkened. He could feel countless invisible threads of magic spreading toward him like a spiderweb.

Though gossamer-fine, they carried terrifying penetrative power, attempting to breach his Occlumency defenses.

In the span of those two sentences, the other party had launched over a dozen extremely subtle mental invasions. If his Occlumency hadn't been strong enough, his mind would likely have been thoroughly rifled through by now.

"Quite a sophisticated Legilimency..." Sagres said coldly. "But if you don't want to end up as a corpse, stop trying to break through my Occlumency."

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Here's an extra chapter for the day, coz why not?😎